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प्रश्न
What is inhibin? State its functions.
उत्तर
inhibin is a hormone secreted by Sertoli cells of testes which is involved in the negative feedback control of sperm production.
संबंधित प्रश्न
Name the parts of the human female reproductive system where
i. fertilisation takes place
ii. implantation of the fertilised egg occurs
When a cell reproduces, what happens to its DNA?
Give scientific reasons: Mature erythrocytes in humans lack nucleus and mitochondria
The diagram given below is that of a developing human foetus. Study the diagram and then answer the questions that follow:
(i) Label the parts numbered 1 to 3 in the diagram.
(ii) Mention any two functions of the part labelled 2 in the diagram.
(iii) Explain the significance of the part numbered 3 in the diagram.
(iv) Define the term ‘Gestation’. What is the normal gestational period of the developing human embryo?
(v) Mention the sex chromosomes in a male and female embryo.
State the main function of the Sperm duct.
Give biological explanations for All the food chains begin with green plants.
What is the scientific name of birth canal?
Fertilisation results immediately in the formation of :
(a) a zygote
(b) an embryo
(c) a placenta
(d) a foetus
In a flower, the parts that produce male and female gametes are respectively :
(a) sepal and anther
(b) filament and stigma
(c) anther and ovary
(d) stamen and style
Explain why, a human zygote is more likely to grow into an adult than a frog zygote.
“Gender of child is determined by the male partner of couple”. Draw a diagram explaining the above statement.
Choose the correct answer:
The aim of sexual reproduction _________
Name the following:
Two accessory glands in the male reproductive system.
Define the following:
Asexual reproduction
Differentiate
Sexual Reproduction and Asexual Reproduction.
Column ‘II’ is a list of items related to ideas in Column ‘I’. Match the term in Column ‘II’ with a suitable idea given in Column ‘I’.
| Column I | Column II |
| (i) Acrosome
(ii) Ovulation (iii) Sperm (iv) Menopause (v) Implantation (vi) Fertilization (vii) Contraception in males |
(a) Male gamete
(b) Oviduct (c) Uterus (d) Spermatozoa (e) Progesterone (f) Stoppage of the menstrual cycle (g) Sudden change in genes |
Choose the Odd One Out:
What is the composition of semen?
Correct sequence in development is ______.
Distinguish between Vasa efferentia and Vasa deferentia.
